Actiony:
- Jujutsu Kaisen: probably the raddest one coming out right now in my opinion. Beautiful art and fight scenes. Great story.
- One Punch Man: Love it. Very goofy. Again great art and fight scenes. Just be ready to have watched everything out and still no 3rd season.
- Blue Exorcist: Classic boy finds out he has powers. Goes to a cool high school to train. I thought it was fun, plus I'm a sucker for supernatural stuff.
- Code Geass: Great story with some political intrigue. I think this is on a lot of people's top 10s.
- All of Gundam: If you want to get sucked into a whole world with tons of series get into Gundam.
- Deathnote: Fun cat and mouse thriller. Reminds me very much of Sherlock and Moriarty style cat and mouse games.
- K: First season is great. Unfortunately I couldn't get through the first episode of the second season. Maybe I'll try it out some other time.
- Castlevania: Follows the storylines similar to the video games. Just brutal vampire shit. It's great.
- Megalo Box: This one is amazing. Lofi hiphop vibes and a great underdog rocky style boxing story. Really gave me Bebop/Champloo vibes.
- Assassination Classroom: Weird concept. I didn't think I would like it but came to love it. Kids have to learn to kill their alien teacher by learning to be assassins.
Some non-actiony animes if you are looking to branch out that i've enjoyed are Saiki K, Food Wars (so fan servicey but a really fun story if you ever liked Iron Chef), Zom100 (I guess this is kinda actiony, but more fun), Mashle (again actiony, but more goofy).
I could probably list a million more but my list is getting really long. I also second the recommendations in the other replies.
Oh ya another great one! I'm excited to see how it shapes up but I've heard good things from people who read the manga.